1895 



THE MICROSCOPE. 



67 



Helps toward the Study of the Radiolaria. 



By FRED'K B. CARTER, 



MONTCLAIR, N. J. 

 (Continued from page 55.) 



In the Nassellaria or Monopylsea, . the fundamental 

 form of the central capsule is egg-shaped instead of 

 spherical, and the pores, instead of being distributed all 

 over it, are confined to one area, and the skeleton has 

 the shape of an Qgg, cone, or bee-hive, with one large 

 mouth or opening. Here are two main divisions. In 

 the first the lattice shell is not complete. There is only 



one order in this division, so that if the form consists of 

 a ring or of several rings (see Figs. 21-23) it belongs to 

 the order Stephoidea which means, like a crown or 

 wreath. In the Earn. Stephanida there is only one ring 

 and the genera are thus distinguished : — Zygocircus has 

 simple spines, while in Dendrocircus the spines are 

 branched, giving the appearance of foliage : Cortina and 



